What version is your SteamVR? 1.5? or 1.48? I tested a VR project because of another “bug” in vr spectator mode with Preview 2 or 3 and it worked for me with the . But I found that Steam VR 1.48 for example doesnt work at all with the anymore. Although this is quite old too. But maybe that helsp and somehow, your steamVR version did not update. Anyway, works for me, didnt test with preview4 yet though